Design for testability (DFT) in PCB Design - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a test point in the PCB schematic.

PCB Design

test_point = [1]('TP1', net='GND')

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ATestPoint

BTrace

CVia

DPad

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Trace' or 'Via' instead of a test point component.

The TestPoint component is used to create a test point on the PCB for measurement or debugging.

2fill in blank

medium

Complete the code to add a boundary scan chain for testing.

PCB Design

boundary_scan = DFT.[1](pins=['TDI', 'TDO', 'TCK', 'TMS'])

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AAddScanChain

BDefineScanChain

CCreateScanChain

DInsertScanChain

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'AddScanChain' which is not the correct method name.

The method CreateScanChain initializes a boundary scan chain with the specified pins for testability.

3fill in blank

hard

Fix the error in the DFT test coverage calculation code.

PCB Design

coverage = DFT.calculate_coverage([1]=test_points, nets=net_list)

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Atest_points_list

Btestpoint

CtestPoints

Dtest_points

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect parameter names causing runtime errors.

The parameter name must exactly match test_points to pass the list of test points correctly.

4fill in blank

hard

Fill both blanks to define a test access port and enable scan mode.

PCB Design

tap = DFT.[1](id='TAP1')
tap.[2](enable=True)

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ATestAccessPort

Benable_scan

Cactivate_scan

DScanPort

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'ScanPort' instead of 'TestAccessPort' or wrong method names.

The TestAccessPort creates the port, and enable_scan activates scan mode for testing.

5fill in blank

hard

Fill all three blanks to create a DFT report with coverage, faults, and test points.

PCB Design

report = DFT.Report([1]=coverage, [2]=faults, test_points=test_points)
report.[3]()

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Acoverage

Bfaults

Cgenerate

Dtest_points

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'test_points' as a method instead of a parameter.

The report is created with coverage, faults, and test_points data, then generate() is called to produce the report output.